Read this it may answer some questions.

http://boards.cannabis.com/grow-faqs...mping-off.html
Zandor Reviewed by Zandor on . Plant dying :( pls help Hey guys/gals, Here's the deal : Had 6 plants, 3 turned out male, 3 female (yay). They've all had equal treatment, and recently I had a Thrip problem, little devils eating up my leaves, but I'm dealing with it and it's going ok, their numbers are getting less now. One of the plants is in serious trouble; leaves are droopy (no overwatering), getting a dark brownish color and dying off. This is happening even on the higher leaves that haven't been touched by the thrips. When I first Rating: 5